<template>
	<el-breadcrumb separator-class="el-icon-arrow-right">
		<transition-group name="breadcrumb">
			<el-breadcrumb-item v-for="item of breadcrumbs" :key="item.path">
				<span class="breadcrumb-title">{{ item.meta?.title }}</span>
			</el-breadcrumb-item>
		</transition-group>
	</el-breadcrumb>
</template>

<script lang="ts">
import { defineComponent, onMounted, shallowReactive, watch } from 'vue'
import { RouteLocationMatched, useRoute } from 'vue-router'
export default defineComponent({
	name: 'Breadcrumb',
	setup() {
		const breadcrumbs = shallowReactive([] as Array<RouteLocationMatched>)
		const route = useRoute()
		function generatorBreadcrumb() {
			breadcrumbs.length = 0
			breadcrumbs.push(
				...route.matched.filter(it => {
					return it.meta && it.meta.title
				})
			)
		}
		watch(
			() => route.path,
			() => {
				generatorBreadcrumb()
			}
		)
		onMounted(generatorBreadcrumb)
		return {
			breadcrumbs
		}
	}
})
</script>
